First Midwest Bancorp (ONBPP) S-4/A Registration of securities issued in business combination transactions (amended)

Exhibit 23.3

Consent of Independent Auditor

We consent to the incorporation by reference in the Registration Statement on Form S-4/A of First Midwest Bancorp, Inc. of our report dated March 16, 2016, relating to the consolidated financial statements of Standard Bancshares, Inc. and Subsidiaries appearing in this Current Report on Form S-4/A.

We also consent to the reference of our firm under the heading “Experts” in such Registration Statement.

/s/ RSM US LLP

Schaumburg, Illinois

October 24, 2016